Well, the weekend with Richard went much better than I thought -- I needn't have worried:
1) He appeared to love my cats, who loved him THIIIISSS MUCH!
2) We think we can, with minor compromises, get his household and my household put together. But we're definitely going Winter palette in the living room to go with his Chinese wall hangings, while the bedroom is going to be home to the botanical prints and the Summer palette. (Time to find an appropriate wallpaper border for the living room)
3) He's really good at pitching in to organize and help clean -- we moved furniture, put some things (wine crates) in storage, and graphed the living room layout.
4) He prefers my mattresses to his (I know how to pick quality mattresses -- I AM a consumer economist after all) so the antique bed stays. (Yay! I dreaded putting that into storage!)
5) His allergies didn't act up.